Grinder



v Sept. 19, 1933. R. p. THOMPSON 1,927,104

GRINDER Filed Oct. 23, 1950 2 SheetS-Sheet l Fla/ fla 2.

A TTRNEKS Sept. 19, 1933. R Fl THQMPSON 1,927,104

GRINDER Filed oct. 25, 1950 2 sheets-sheet 2 /A/ VEA/ron f C Kw4-0W JW #JAM/9mm Patenteclhsept. 179, 1933 STATES GRINDER Ralph l. Thompson, Pocomoke, Md., assigner of cncehalf to William A. Scholey, Ann Arbor,

Mich.

Appli-cation October 23,

11 Claims.

This invention relates to improvements in grinders, and has for its object a grinding apparatus in which the grinding table is supported in such a manner that it may be adjusted in a horizontal plane, or in any plane approximately horizontal.

It is also an object oi this invention to provide in connection with a table a grinding wheel, and

means for supporting the grinding wheel in such a manner that it may be moved freely over the table and at the same time be supported in substantially a condition of equilibrium.

It is a further object or" this invention to provide in connection with a support member a grinding table supported either in a horizontal plane or any kplane substantially horizontal, and in addition thereto an arm supported for a ver-k tical adjustment and adapted to swing in a horizontal plane over the face of the table.

It is an object of my invention to provide a swingingarm` pvotally mounted at a distance from a grinding table, with vertical guides nearer to the table than the pivotal bearings of the swinging arm, thereby providing means'to keep up to the vertical guides to thereby reduce to a minimum the side pull on the guides.

It is a fundamental feature kof my invention to provide a compound adjustment of the grindingtable in combination with a swinging arm.

I accomplish my object by a novel construction which renders it possible for the operator to .quickly and accurately adjust the work to be ground, and to follow with an easy manual operation of grinding. The kwork is supportedfupon a table that may be tilted toward lany point of the compass so that the w-orkmay be adjusted and ground at any desired angle in relation to the surface'that rests upon the grinding table. A swinging arm is provided that swings horizontally and carries at its free end a grinding wheel. The swinging arm is pivotally mounted in such a manner as to cause the wheel to travel in an arc across the face of the work when the arm isV the center of weight of the swinging arm close ing Ytable in regard to its horizontal position.

1930. serial No. 490,611

Figure 4 is a top plan View of the structure shown in Figure 3.

Figure 5 is a view similar to Figures l and 3 showing the grinding table mounted on the intermediate table. .f

Figure 6 is a view of the structure shown in Figure 5 but at a right angle thereto.

Figure? is a view similar to Figure l but with the adjustable carriers mounted on thek guides.

Figure 8 is a top plan view of the structure 65 shown in Figure '7.

Figure 9 is a side elevation of the completed structure showing the adjustable table, the car* riage on the guides, and the rocker arm carried by the carriage.

Figure 10r is a top plan View of the structure shown in Figure 9.

The different gures show progressively the different steps in the construction and formation oi this grinder. The reference numeral l is used lto designate a support or standard which is formed oi a hollow casting. Extending to one side at the upper end of this Vsupport orstandard is an arm 2, which has on its outer end two vertical openings through which guides 3 extend. 80 The lower ends of these guides rest in shoes 4 and are supported in a vertical position, as clearly shown from the different iigures.

On the other side of the support or standard from the arm 2 is a pair of trunnions 5 which 85 pivotally support an intermediate table 6, which has extending from one side thereof a pair of arms 7 with holes therein to receive the trunnions 5. Extending downwardly from the body part'y of thev intermediate table is a vertical arm 8,

which has extending therethrough substantially horizontally a screw member 9. The inner end of this screw member engages the standard or support, whilev on the outer end there isl a hand wheel 10. By operating this hand wheel the position of the intermediate table 6 may be adjusted in regard to the horizontal plane.

On one end of the intermediate table is a lug ll which extends upwardly therefrom and'has on each end a trunnion 12. These trunnions are at rightangles to the trunnions 5 and constitute a pivotal'support for a grinding table 13, which has extending downwardly therefrom at one end ears or arms 14, with holes therein to receive the trunnions 12. The other end oi the grinding table 13 is supported and adjusted by means of a screw 15, which extends through the intermediate table. vThis screw is operated'by a hand wheel 16 for the purpose of adjusting thegrind- 110 By means of the screws 9 and 15 the grinding table 13 may be adjusted to any position from a horizontal. plane to a plane not horizontal, providing the inclination of the plane be not too great from the horizontal.

The upper ends oi' the guides 3 are reduced in size and have supported (thereon a head block 17, as shown in Figures 7 and 9. This head block is held in position on the upper ends of the guides by means oi nuts. This head block is triangular in shape, having the guide members extending through two of the corners, while extending through the other corner is a screw member 18 the lower end of which is threaded into a carriage while on the upper end there is an operating wheel 19.

The carriage is in dicated by the numeral 20 and has extending there-from at each end an arm 21. Each of these arms has a pair of holes therethrough for receiving the guides 3. In the present instance one arm above the arm 2 of the support member, while the other arm is beneath the arm 2. By this means the carriage is supported in a fairly nrm condition in its adjustment vertically by means of the screw 18.

Extending from the carriage opposite the arms 2l are two other arms 22. These arms 22 are not only opposite the arms 21 'but are also oppositely extending from the grinding table. In these arms 22 are holes for receiving trunnions or bearing members on a swinging arm 23. For engaging the holes in the arms 22 the swinging arm is provided with two bearing members or trunnions 24, as shown in Figure 9. One or" these trunnions is on one end of the swinging arm, while the other of the swinging arm will move over the face ofthe grinding table, and in order to permit the free swinging movement of this arm the arm has not only the foregoing curved structure, as shown in Figure 9, but is also curved as shown in Figure 10, so that it may freelyv swing and not be obstructed by any of its supporting structure. In Figure 10 the grinder is shown supported immediately above the central part of the grinding table, but is shown in dotted lines with the grinding means at each end oi the table. Not only are the relative positions of the grinding means shown but the relative positions of the arm 23 are shown.

On the outer end of the swinging arm 23 and over the grinding table is a motor 25, which has extending therefrom the usual motor shaft. On this shaft is the grinding wheel 26 which rotates above the face of the grinding table. For the purpose of manipulating the grinding wheel and 'swinging the swinging arm there is provided a knob 27 to be gripped by the hand of the operator. `As shown in Figure 9 the table may be adjusted by operating the wheels v1) and 16. The operation of these wheels adjusts the horizontal or relatively horizontal position of the table. The operation of the wheel 19 adjusts the carriage 20 vertically up and down on the guides 3. By operation of the screw 18 the grinding wheel may be `brought near to or removed from the grinding table. By regulating the horizontal position of the table the operator is able to determine whether the two faces of the object worked upon shall be parallel or at an angle one to the other. rihis angularity may be adjusted by operation oi the wheels l0 and 15.

I desire to comprehend within my invention such modiiications as may be embraced within my claims and the scope of my invention.

Having thus fully described my invention, what I claim is new and desire to secure byy Letters Patent, is:

1. In a machine for grinding in a plane, a structural member with Vertical guides thereon, a carriage slidably mounted upon said guides and means for adjusting said carriage to various heights thereon, a swinging arm pivotally mounted upon said carriage and adapted to swing horizontally, a grinding spindle mounted in bearings upon said swinging' arm at a distance from said pivotal bearings or" said arm greater than the distance from said pivotal bearings to said vertical guides, a work table supported by said structural member, said swingingv arm adapted to swing said grinding spindle in an arc across the face of said work table with the lines of said vertical guides cutting a triangular plane, the triangle of said plane having a point at each end of said arc of travel of said grinding spindle and its other point coincident with the axial line oi the said pivotal bearings of said swinging arm.

2. In a grinding machine, a structural member and a grinding table supported thereby, vertical guides upon said structural member adjacent to said grinding table, a carriage mounted upon said vertical guides, pivotal bearings upon said carriage the axial line of which parallels the said vertical guides on the side vopposite thereof from the said grinding table, a swinging arm mounted to swing horizontally upon said pivotal bearings of said carriage, and a grinding spindle mounted in bearings upon said swinging arm at a distance from said pivotal bearings to cause said grinding spindle to travel in an arc across the faceof said grinding table, said arm having a crook in the horizontal dimension thereof to cause said arm to encompass said vertical guides at one extreme of the travel of l said swinging arm.

3. In a grinding machine 'for grinding in a 125- plane, a structural member, a grinding table supported by said structural member, an intermediate supporting member for said grinding table, said supporting member being articulated upon said structural memberin such ashion as to cause it to have a tilting motion in two directions from that .of a horizontal plane, said grinding table articulated upon said intermediate supporting member in such fashion as to cause it to have a tilting motion in twodirections from that of a horizontal plane, the axes of said articulations of said table upon said intermediate supporting .member and said. supporting member upon said structural member arranged at right angles to each other, a swinging armV supported by said structural member upon pivotal bearings, and a grinding spindle mounted upon the free end of said vswinging arm, said swinging arm adapted to pass said grinding spindle back and forth across the face of said grinding table.

Il. In a grinder, a support, a table pivoted at one side to said support, a second table pivoted at one end to the first table, the pivot of the second table being at right angles to the pivot 350 of the first table, an arm pivotally and slidably supported at one end by the support for vertical adjustment and swinging movement, and a grinder carried by the other end of the arm and adapted to be moved over the tables.

5. In a grinder, a support having trunnions thereon, a table pivoted at one side to said trunnions, means engaging the other side to adjust said table on the trunnions, said table having trunnions thereon at one end at right angles to the iirst trunnions, a second table pivoted at one end to the second trunnions, means engaging the other end of the second table to adjust it on its trunnions, and grinding means carried by the support for vertical adjustment and for movement over the last-named table.

6. In a grinder, a support member, a grinding table supported thereby and adapted to be adjusted to a horizontal plane or any plane approximately horizontal, a vertical guide on said support member, a carriage on said guide, means to adjust the carriage on said guide, an arm pivoted at one end to said carriage, and a grinding means carried by the other end of said arm for travel across the face of the grinding table.

7. In a grinder, a table supported for adjustment to a horizontal plane or any plane approximately horizontal, a guide member adjacent the table, a carriage on said guide member, means to adjust the carriage vertically on said guide member, an arm pvoted to said carriage opposite the table, and a grinding means on said arm adapted to travel over the face of the table.

8. In a grinder, a support member having on one side a grinding table, means to adjust said table to a horizontal plane or any other plane approximately horizontal, a pair of vertical guides on the side of said support opposite the table, a

carriage on said guides opposite the support member, means to adjust the carriage vertically on the guides, an arm pivoted at one end to the side of the carriage opposite the table, said arm being curved so that its free end may pass over the table, and a grinding means on the free end of the arm adapted to travel over the face of the table.

9. In a tool of the character described, a grinding table, means for providing a compound adjustment therefor, a swinging arm having on one end a grinder for movement over the table, vertical guides for said swinging arm, and means for pivotally supporting the other end of said swinging arm so that the vertical guides are between the pivotal support of the swinging arm and said grinding table. l

10. In combination, a support, a grinding table adjustably mounted thereon, a pivotally mounted swinging arm having a tool on one end adapted to move over said grinding table, a guide for the other end of said swinging arm located between one end of the arm and said table whereby the center of weight of the swinging arm may be maintained relatively close to the guide, and the side pull on the guide reduced to a minimum.

11. In combination, afsupp'ort, a grinding table, means for eiecting a compound adjustment of said grinding table with respect to said support, a vertical guide, a pivotal support thereon for a swinging arm, a tool carrying swinging arm so pivoted to said support that the guide is between its pivotal support and the table, and the arm is arranged to extend from its pivotal support from a point behind the guide from the table, around the guide to a point over the table.

RALPH P. THOMPSON. 

